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		<h1>shell 练习-脚本传参</h1>
	
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		<span class="article__date">2017-10-12</span><br />
		
		
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			  	<a class="article__tag-link" href="/tags/shell练习/">shell练习</a>
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		<p>使用传参的方法写个脚本，实现加减乘除的功能。例如：  sh  a.sh  1   2，这样会分别计算加、减、乘、除的结果。</p>
<p>要求：</p>
<ol>
<li>脚本需判断提供的两个数字必须为整数</li>
<li>当做减法或者除法时，需要判断哪个数字大</li>
<li>减法时需要用大的数字减小的数字</li>
<li>除法时需要用大的数字除以小的数字，并且结果需要保留两个小数点。</li>
</ol>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div></pre></td><td class="code"><pre><div class="line"><span class="meta">#!/bin/bash</span></div><div class="line"><span class="keyword">if</span> [ <span class="variable">$#</span> -ne 2 ]</div><div class="line"><span class="keyword">then</span></div><div class="line">    <span class="built_in">echo</span> <span class="string">"The number of parameter is not 2, Please useage: ./<span class="variable">$0</span> 1 2"</span></div><div class="line">    <span class="built_in">exit</span> 1</div><div class="line"><span class="keyword">fi</span></div><div class="line"></div><div class="line">is_int()</div><div class="line">&#123;</div><div class="line">    <span class="keyword">if</span> <span class="built_in">echo</span> <span class="string">"<span class="variable">$1</span>"</span>|grep -q <span class="string">'[^0-9]'</span></div><div class="line">    <span class="keyword">then</span></div><div class="line">    <span class="built_in">echo</span> <span class="string">"<span class="variable">$1</span> is not integer number."</span></div><div class="line">    <span class="built_in">exit</span> 1</div><div class="line">    <span class="keyword">fi</span></div><div class="line">&#125;</div><div class="line"></div><div class="line">max()</div><div class="line">&#123;</div><div class="line">    <span class="keyword">if</span> [ <span class="variable">$1</span> -ge <span class="variable">$2</span> ]</div><div class="line">    <span class="keyword">then</span></div><div class="line">    <span class="built_in">echo</span> <span class="variable">$1</span></div><div class="line">    <span class="keyword">else</span></div><div class="line">    <span class="built_in">echo</span> <span class="variable">$2</span></div><div class="line">    <span class="keyword">fi</span></div><div class="line">&#125;</div><div class="line"></div><div class="line">min()</div><div class="line">&#123;</div><div class="line">    <span class="keyword">if</span> [ <span class="variable">$1</span> -lt <span class="variable">$2</span> ]</div><div class="line">    <span class="keyword">then</span></div><div class="line">    <span class="built_in">echo</span> <span class="variable">$1</span></div><div class="line">    <span class="keyword">else</span></div><div class="line">    <span class="built_in">echo</span> <span class="variable">$2</span></div><div class="line">    <span class="keyword">fi</span></div><div class="line">&#125;</div><div class="line"></div><div class="line">sum()</div><div class="line">&#123;</div><div class="line">    <span class="built_in">echo</span> <span class="string">"<span class="variable">$1</span> + <span class="variable">$2</span> = $[<span class="variable">$1</span>+<span class="variable">$2</span>]"</span></div><div class="line">&#125;</div><div class="line"></div><div class="line">minus()</div><div class="line">&#123;</div><div class="line">    big=`max <span class="variable">$1</span> <span class="variable">$2</span>`</div><div class="line">    small=`min <span class="variable">$1</span> <span class="variable">$2</span>`</div><div class="line">    <span class="built_in">echo</span> <span class="string">"<span class="variable">$big</span> - <span class="variable">$small</span> = $[<span class="variable">$big</span>-<span class="variable">$small</span>]"</span></div><div class="line">&#125;</div><div class="line"></div><div class="line">mult()</div><div class="line">&#123;</div><div class="line">    <span class="built_in">echo</span> <span class="string">"<span class="variable">$1</span> * <span class="variable">$2</span> = $[<span class="variable">$1</span>*<span class="variable">$2</span>]"</span></div><div class="line">&#125;</div><div class="line"></div><div class="line">div()</div><div class="line">&#123;</div><div class="line">    big=`max <span class="variable">$1</span> <span class="variable">$2</span>`</div><div class="line">    small=`min <span class="variable">$1</span> <span class="variable">$2</span>`</div><div class="line">    d=`<span class="built_in">echo</span> <span class="string">"scale =2; <span class="variable">$big</span> / <span class="variable">$small</span>"</span>|bc`</div><div class="line">    <span class="built_in">echo</span> <span class="string">"<span class="variable">$big</span> / <span class="variable">$small</span> = <span class="variable">$d</span>"</span></div><div class="line">&#125;</div><div class="line"></div><div class="line">is_int <span class="variable">$1</span></div><div class="line">is_int <span class="variable">$2</span></div><div class="line">sum <span class="variable">$1</span> <span class="variable">$2</span></div><div class="line">minus <span class="variable">$1</span> <span class="variable">$2</span></div><div class="line">mult <span class="variable">$1</span> <span class="variable">$2</span></div><div class="line">div <span class="variable">$1</span> <span class="variable">$2</span></div></pre></td></tr></table></figure>
	

	
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